Vamp-throating die.



No. 7l6,876. Patented Dec. 30, |902.

` a. F.. DUNN. Y VAIHP THROATING DIE; [Application led Jan. 17, 1902.)n (No Model.) 2 Sheets-Sheet 2.

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UNITED STATES PATENT OEEICE.

GEORGE F. DUNN, OF BROCKTON, MASSACHUSETTS.

VANI P-THROATING DIE.

SPECIFICATION forming part of Letters Patent No. 716,876, dated DecemberO, 1902.

Application filed January 17, 1902. Serial Nn. 90,168. (No model.)

To a/ZZ whom it may concern,.-

Be it known that I, GEORGE F. DUNN, of Brockton, in the county of Plymou th and State of Massachusetts, have invented certain new and useful Improvements in Vamp-'lhroatin g Dies, of which the following is a specification.

This invention relates to a machine for throating Vamps of boots and shoes-'t'. e., for cutting out an open-ended. recess in the material, so as to leave a substantially U -shaped curve on the innerV edge. The machine is adapted for all dieing-out Work of this nature in which the shape imparted to the work by the removal of material is an open ended curve.

The invention has for its objects to make smooth work and provide a die which is inexpensive to manufacture and is capable of being easily adjusted.

Of the accompanying drawings, Figure 1 represents a side elevation of the die and block of a die-press constructed in accordance with my invention. Fig. 2 represents a longitudinal sectional view. Fig. 3 represents a top plan view of the holder and attached parts. Fig. 4 represents a reverse planview thereof.

The same reference characters indicate the same parts in all the igures.

Referring to the drawings, 1 represents a vertically-reciprocating frame carrying a die which is made up of a base or holder 2, a cutting-blade or knife 3, a'sectional carrier 4 4 5 for said cutting-blade, and means for adjusting said carrier. The cutting-blade 3 is a thin iiexible steelribbon bent into a U shape and sharpened on its lower edge, so that when it descends upon the work mounted upon the die-block 6 it will die out a recess in thework by severing an oblong piece of material therefrom, which operation is commonly known as throating the Vamps.

The knife-carrier is made up of two elongated side sections 4 4 and an end section 5, all of which are grooved to receive the back edge of the blade or knife 3, said knife being .held in engagement with the side sections 4 by means ofpins 7 7 fixed to the knife and oecupying slots 8 8 in the sections 4, which slots are elongated longitudinally to permit the longitudinal movement of the knife with respect to the sections, as hereinafter more fully described. Each of the side sections 4 4 of the knife carrier is provided with two upwardly-projecting studs 9 9, which occupy distud 11, occupying a slot 12 in the holder 2,

elongated in a direction parallel-to the median line of the die.

13 is a screw mounted above the die-holder 2 in fixed bearings 14 14 and capable of rotation in saidlbearings, but not of longitudinal movement. On the forward end of the screw is a hand-wheel lfor rotating it. The screw is provided with a threaded portion 16, on which are mounted two nuts 17 17, which partake of an equal longitudinal movement in the same direction when the screw 14 is rotated. These nuts are connected by links 1S 18 with the studs 9 9 on the side sections 4 of the knife-carrier, so that when longitudinal movement is imparted to the nuts 17 by rotation of the screw the said side sections 4 4 will be caused to approach or recede from each other in a diagonal direction, according to the direction in which the screw is rotated. The screw is provided with another threaded portion 19, engaged with a nut 2G, xed to the upper end ofstud 1 l,V the direction of this thread being suchas to move the nut20 in the same direction as the nuts 17.17 when'the screw is rotated.y The rotation of the screw 14 therefore has the effect of expanding and contracting the cutting-blade 3, the dexibility of said blade permitting it to change its curvature in response to the movements of the sections 4 5. During the expansion and contraction of the blade it moves longitudinally in the grooves of the'side sections 4 4. By properly regulating the pitch of the thread 19 with respect to the thread 16 vthe middle part or bend of the cutting-blade may be given a greater longitudinal movement than the lateral vmovementy imparted yto. its side portions, and a wider rangeof Vamps may thus be acted on in the machine than if the movements of the dierent portions of the cutting-blade were all uniform.

Onione of the nuts 17 I have shown an upwardly projecting pointer 21, coperating with a graduated index-plate 22 on the frame 1, the whole forming a gage whereby the die may be accurately adjusted to work on any size of vamp within its range.

I am aware that it has been proposed prior to my invention to employ an expanding flexible cutter adjusted by means of a sectional carrier, to the sections of which a simultaneous movement is imparted, and I do not claim this broadly.

I do not confine myself to the exact construction herein set forth, as considerable variation may be made without departing from the spirit of my invention.

I claim- 1. In a die for throating Vamps and like purposes, a substantially U-shaped ilexible cutter,side carrier-sections engaging the sides of said cutter at the ends of the bend or curve of the U and in sliding relation `to said cutter, an end carrier-section engaging the cutter at the bottom of the bend of the U, means to impart a relative lateral movement to said side sections for expanding the cutter, and means to impart a relative longitudinal movement to the end and side sections.

2. In a die for throating Vamps and like purposes, a substantially U-shaped cutter, side carrier-sections engaging the sides of the U and in sliding relation thereto, and means for guiding said sections diagonally with respect to each other in predetermined paths.

3. In a die for throating Vamps and like purposes, a substantially U-shaped cutter, side carrier-sections engaging the sides of the U and in sliding relation thereto, means for guiding said sections diagonally with respect to each other in predetermined paths, and an adjusting mechanism common to said sections and having provisions for simultaneously adjusting them.

4. In a die for throating Vamps and like purposes, a substantially U-shaped cutter, side carrier-sections engaging the sides of the U and in sliding relation thereto, means for guiding said sections diagonally with respect to each other in predetermined paths, an adj usting-screw having a device movable longitudinally by rotation of said screw, and connections from said device to the respective side sections.

5. In a die for throating Vamps and like purposes, a substantially U-shaped cutter, side carrier-sections engaging the sides of the U and in sliding relation thereto, an end carrier-section engaging said cutter at the bottom of the bend of the U, means for guiding the side sections diagonally with respect to each other in predetermined paths, a rotatable rod held from axial movement and having two screw-threaded portions of different pitch, a nut on one of said portions having connections with the respective side sections, and a nut on the other portion having a connection with the end section.

In testimony whereof I have affixed my signature in presence of two witnesses.

GEORGE F. DUNN.

Vlitnesses:v

R. M. PIERsoN, C. F. BROWN. 

